package com.atguigu.gulimall.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    /**
     * 查出所有的分类
     * @return
     */
    @Override
    public List<CategoryEntity> listWithTree() {
        // 1.查出所有的分类
        List<CategoryEntity> entities = baseMapper.selectList(null);

        // 2.组装成父子的树形结构

        // 2.1 找到所有的一级分类
        List<CategoryEntity> level1Menus = entities.stream().filter(categoryEntity ->
            categoryEntity.getParentCid() == 0)
                .map(menu -> {
                    menu.setChildren(getChildrens(menu, entities));
                    return menu;
                }).sorted((menu1,menu2) ->{
                    return (menu1.getSort() == null?0: menu1.getSort())-menu2.getSort();
                })
                .collect(Collectors.toList());

        return level1Menus;
    }

    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all) {
        List<CategoryEntity> children = new ArrayList<>();
        for (CategoryEntity categoryEntity : all) {
            if (categoryEntity.getParentCid().equals(root.getCatId())) {
                // 找到子菜单
                categoryEntity.setChildren(getChildrens(categoryEntity, all));
                children.add(categoryEntity);
            }
        }
        // 菜单的排序
        children.sort((menu1, menu2) -> (menu1.getSort() == null ? 0 : menu1.getSort()) - menu2.getSort());
        return children;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO 检查当前删除的菜单是否被其他地方引用
        //逻辑删除
        baseMapper.deleteBatchIds(asList);



    }
}